Bolt threading machine



(No Model.) 2 Sheets-Sheet 1.

I'. MUTIMER.

BOLT THREADING MACHINE.

No. 480,204. Patented Aug. 2, 1892.

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F. MUTIMBR. BOLT THREADING MACHINE.

No. 480,204. Patented Aug. 2, 1892.

NNE

FREDERICK MUTIMER, OF ROOKFORD, ILLINOIS, ASSIGNOR' OF ONE-HALF TO THE ROOKFORD BOLT VORKS, OF SAME PLACE.

BOLT-THREADING MACHINE.

SPECIFICATION forming part of Letters Patent No. 480,204., dated August 2, 1892.

Application filed October 9, 1891. Serial No. 408,260. (No model.)

To all whom, it may concern/.-

Be it known that I, FREDERICK MUTIMER, a citizen of the United States, residing at Rockford,in the county of Vinnebago and State of Illinois, have invented certain new and useful Improvements in Bolt-Threading Machines, of which the following is a specification.

In the accompanying drawings, Figure l is a plan view of my bolt-threading machine, showing it in the operation of cutting a thread. Fig. 2 is also a plan of the same, representing the die-bearing jaws open to allow the removal of the bolt. Fig. 3 is an isometrical representation of the cutting-head of my machine; also, the carriage which carries the bolt as it is fed into the dies when the thread is being cut thereon. Fig. 4 is a longitudinal section through the head, showing the means by which the jaws are thrown open when the thread is out a suiicient distance from the end of the bolt, allowing the bolt to be removed from the dies. Fig. 5 is also a longitudinal section through the head, showing the die-carrying jaws open to allow the removal of the threaded bolt therefrom.

In constructing my bolt-threading machine I employ the ordinary bed 1, supporting the moving parts at a suitable distance from the floor. boxes 2 and 3, within which is journaled the shaft 4 and on which` between the two boxes, is securedthe pulley 5. An extension 6 from the side of lthe boxes 3 supports a rod 7 at a height about equal to that of the main shaft, within which extension the rod is free to slide.

Loosely mounted on the forward end of shaft 4 is the collar S, and the bar 11 is secured by a set-screw in its hub 10 to the rod 7. The forward end of this bar is forked to embrace and lie in the groove of the collar 8. This collar is in contact with the four-arm wedging-hub, the opposite arms 13 of which support a slotted plate 14, and this hub is loosely mounted on shaft l. The forward end of shafts for a little distance is of a less diameter than the remainder of its length, and this portion is threaded. of the main shaft I screw the head 16, in which head are pivoted the die-bearing jaws 17. This head at its forward end is provided with a iiange-faoe 19. Four channels 2O are On the rear end of this bed are the' On this thread` cut through the flange and hub, and in these channels are supported the die-bearing jaws 17. These jaws are pivoted to the hub portion of the head of the pins 2l and extend 55 through the flange 19. On the periphery of this iiange 19 I secure a ring 22, which is held in position by the set-screw 23. In the forward face of each of these jaws that extend through the openings in the ange 19 I out the recesses 6o 24, leaving the end of the jaw intact. Into the recess thus formed in each jaw I set the die 25, held in position by the clamp 26, said die capable of a lengthwise adjustment by the set-screw 27 in the outer end of the jaw. 65

vThe clamp-block 26 is of rectangular form and from one of its edges the wedge-shaped lip depends, its opposite edge turning down in the extension 29. One corner 30 of the sides of the dies is beveled to coincide with the 7o slant of the wedged lip of the clamp, and in the side of each of the jaws 17 I cut the channel 3l, into which the edge 29 of the clamp extends. Through each jaw and its clampblock I make a hole, through which I pass the bolt 32, turning the nut 33 down upon the face of the clamp-block, thus holding` the die 25 firmly in position. On the ring 22, over the rear end of each of the jaws 17, are springs 35, which, bearing on the jaws rearwardly of 8o their pivots, tend to open the forward ends, throwing the dies apart. IVhen a thread is being cut, it is necessary that the jaws remain fixed at the proper distance apart. This I accomplish by thrusting the wedging-hub between the rear ends of the jaws, holding them outward against the action of the fiat springs 35.

Betweenthe wedging-hub and the hub 16 of the head, mounted on the shaft, is a collar 9o 36, through which and through the center of the main shaft a pin 37 extends. IVhere this pin passes through the main shaft, I provide a slotted hole 3S, extending itits lengthwise direction to allow the collara movement lengthwise with the shaft. From this slotted hole forward to the end of the main shaft I provide a hole 39 on the shafts center, and in this hole I place a pin 40, of a certain length, the purpose of which will appear hereinafter.

At the forward end of bed 1 I provide a carriage 42, which is supported above the bed by IOO the ways llf3, and is tree to slide therein. The the rearends ot' thejaws 17, which come in conarm 4A- is bolted to this carriage and extends to and supports the rod 7, parallel with thc lengthwise direction of the bed 1. In the tor- Ward end of the carriage, in its upper face, I cut the transverse groove l5, and through the bed-plate ot the carriage, near the center of this groove, is formed the slotted hole N5, providing a lateral adjustment of the post 4-7. At a point about midway of the height of the post 47 I provide a slotted hole 5t), and a threaded shank 5l, extending trom the bar a2, passes through this slot and is held in position by the nut 55S, pressing against the rear face of the post At7. The plates 5-1 and are bolted to the upper face et the bar 52, the plate 55 being slotted in its forward upturned end to receive and hold the square vshoulder ot the bolt-blank, while the plate 51 is provided with the slot 5G to allow an adjustment for the thickness ot' the 'head ol` the bolt, which lies between the two uptnrned ends of these plates. On the rod 7 I place a collar 57 forward of the supporting-arm tl, extending from the carriage, and this collar, being fixed to the rod by means of a setscrew 58, is placed at such a point in the length of the rod that when the carriage is moved from the head a sull'icient distance to allow the boltblank to `be placed in the slot 5l the arm 4st will have engaged the collar 57 and pulled the rod 7 forward a sui'ticient distance to throw the wedginghub between the rear ends of the jaws 17, closing the dies 25 into position for cutting the thread. rIhe boltblank having been set in the slot of the plate 55, the carriage is moved outward toward the dies by means of the pivotcd lever 59, extending through the loop GO, and the head being rotated in the proper direction the bolt-blank may be started into the dies and the thread cut thereon. As the dies cnt the thread on the blank, the carriage on which it 1s mounted is moved toward the head and that portion of the blank that has passed through the dies enters t-he hole 3l). The pin l0, lying within the hole Si), is forced by the advancing' bolt-blank against the transverse pin 1 -37,and this in turn and the collar S6, to which 1t isal'lixed, are pushed baelmvard. The collar 3G bears against the wedging-hub, and as this rccedes from its position between the rear ends of thcjaw 17 the latter are rocked on their pivotal pins 2l by the action of the springs S5, freeing the dies from the bolt upon which the thread has been cut and renderingitpossible to withdraw the bolts from between them, which is done by moving the carriage backward. To accomplish this movement suiliciently to allow the removal ot the bolts, the arm et engages the collar 57, and the rod 7 will be brought backward with the carriage, moving the grooved collar S against the wedging-hub, forcing it forward between the rear extensions of the jaws 17, and again throwing the jaws into proper position tor threadcutting. The faces ot the wedging-hub and tact with each other are formed by the hardcned plates til. rlhe plates 1st, supported by the arms 13 ot the wedging-hub, being slotted, allow the jaws 17 to ascend the incline of the hub, and also lforni a connection between the jaws and the hub, so that they will revolve in unison.

I claim as my invention- 1. In a bolt-threading machine, the coinbination of a revolving head, jaws pivoted therein, dies aliixed by clamps to the jaws, said clamps formed with two depending lips, a groove in each jaw for one ot the lips, the other lip engaging the bevel-edge of tho die, a bolt for holding` the clamp in position, and means for opening and closing the dies.

In a bolt-threading machine, the coni bination ot a revolving head, jaws pivoted therein, and a movable wedging-hub having radial ribs thereon, one or more ot said ribs provided with a slotted plate for receiving the end of one of thepivoted jaws, forming a rotative connection between the hub andthe revolving head.

il. In a l'Jolt-thrcading machine, the comA bination of a revolving head, jaws pivoted therein, a movable wedging-hub having radial ribs thereon, one or more of said ribs provided with a slotted plate for receiving the end of one ot" the pivoted jaws, the plate having [langes for engaging the sides of its rib, and means for securing the plate to the rib.

e. In a bolt-threading machine, the coinbination of a hub having a sliding connection with the driving-shaft and having also a slotted face, jaws located in the slots, and a ring encircling the periphery ot the tace, forming stops Ior the jaws.

5. In a bolt-threading machine, the combination of a hub having a rotative connec tion with the driving-shaft, said hub having a slotted face, jaws located in the slots, a ring encircling the periphery of the face, and springs supported by the ring for operating the jaws.

(i. In a bolt-threading machine, the conibination of a supporting-frame, a revolving head, dies movably secured therein, ways on the frame, a carriage on the ways, a post on the carriage, having a vertically-elongated opening and capable of lateral adjustment, and a bar movably secured to the post, said bar supporting a bolt'holding device.

7. In a bolt-threading machine, the colnbination of a revolving head, jaws pivoted therein and having a recess in one face thereof, dies located in the recess and having a beveledge, and a clamp secured to the jaw overlying the die and having a lip with a bevelface engaging the bevel-edge ot' the die, holding it in position.

Vitnesses:

(maximes 1t. Wise, L. L. MILLER. 

